Process and coating material for surfaces



R XP. 2,339,317

Patented Jan. 18, 1944 PROCESS AND COATING MATERIAL FOR SURFACES JosephW. Ayers, Milwaukee, Win, assiznor to Agicide Laboratories, Inc.,Milwaukee, Win, a corporation of Delaware No Drawing. Application June29, 1942, Serial No. 9,011

6 Claims. (Cl. 117-25) This invention relates in general to paintcoatlngs and more particularly to a process and ma ierial for producingmat surfa-ze coating applicabie to a wide variety of surfaces.

A particular use for the material to be described is: the camouflagingof military equipment, helmets. and the roofs of airplane hangars or thelike. The coating to be described may be modified to fulfillrequirements for light-weight, resistance to abrasion, light absorption,and simplicity of application. The material has the additional qualityof not only absorbing infra red rays but uniformly diffusing lightprojected thereupon, whereby a surface thus coated is relativelydifllcuit to photograph.

Materials heretofore used for this purpose usually comprised a mixturewith a paint base of pulverized cork, wood f ber or sand particles. Thephysical characteristics and behavior of these materials wereobjectionable in use principally because of the lack of bond between theparticles and the paint base, the lack of wear-resistant qualities, andthe diillculty in obtaining uniform textures. All of these objectionsare overcome in the present invention in which a principal object is theprocess of forming a coating having a mat surface of uniform textureresulting from the close bonding of pre-graded nut shell flour with asurface and a subsequent application of pigmentcarrying paint or lacquerthereon for producing desired color effects.

It is a further object of the invention to provide a mixture oi. a paintbase and pro-graded nut shell flour in the form of a viscous liquid forapplication to surfaces.

These and other objects and advantages '"ill appear in the followingdescription and claims.

In a preferred form, the surface to be coated is given a priming coat oiair-drying paint or lacquer and while this cost is in a "tacky"eondition, a pro-graded granulated nut shell flour is dusted uniformlythereon. The nut shell partlciea will embed themselves in the primingcont and thus he held in close proximity with each other on the surface.The rcsuiliiuu routing is preferably oven-halted in liilil to lliiulvluuul the particles and complete the drying of the prime cont.

After the above drying operation is completed. one or more coats ofpaint or pigment-carrying lacquer is sprayed on the resultant surfac tosuit] the nut shell particles and to obtain a desired final shade ofcolor.

A particular application for the above-described coating was preparedfor the United States Government military h l in which walnut shellflour graded through a 12 to 20 mesh screen was applied to the primingcoat, and after baking, two coats of synthetic standard olive drabenamel were sprayed upon the surface. The resultant coating proved to beextremely slstant, light-diffusing, and did not add excessively to theweight of the helmets.

Another modification ofthe coating material includes the application ofclear or translucent adhesive to the surface and alter the applicationof nut shell flour, to cover the resultant surface with a clear ortranslucent lacquer coating which produces a natural-color surfacedependent upon the color of the uncoated surface and the nut shellparticles.

Further modifications include the preparation of pre-graded walnut shellflour mixed with prepared paints and lacquers and the resultant mixturesprayed directly upon the surface to be coated with a spray gun having aspecial nozzle.

Although thlsinventlon has particular merit as a camouilaging paint,other useful and ornamental etlects may be obtained. A particularapplication for the present invention is found in taking ad'.*antage ctthe light-dlffusing characteristics in covering irregular or defectivesurfaces whereby such irregularities and defects are not apparent to theeye.

Having described my invention, I claim:

1. A process of applying granular coatings to surfaces including theapplication of a film of an air-drying adhesive said adhesive comprisinga mixtur of cemcntitious material and volatile products to the saidsurface and while the said adhesive is still in a viscous state, thedusting of pie-graded nut shell particles thereupon and subsequentlyapplying a coat of said adhesive over the dusted surface.

2. A process of applying granular coatings to surfaces including theapplication of a film of air-drying adhesive said adhesive comprising amixture of ci-mentitiou'l material and volatile odde i0 tin \lili'lsurface and while the said adlwsiuis iillil in a viscous state, thediluting of preiiuuin. \vnluut shell particles thereon and heatmg thedusted surface to dryness and then applyllg a coat of alr-dry'ng,color-carrying cementi. tious compound to the dusted surface.

3. A coating material for surfaces comprising a lnyeroi air-dryingadhesive said adhesive comprising a mixture of cementitlous material andvolatile products, a layer of nut shell hour particles of substantiallypredetermined size; em-

bedded in said adhesive and a covering film of a dryable cementitiouscompound.

4. A coating material for surface; comprising a layer 01' air-dryin:adhesive said adhesive comprising a-mixture oi cementitious material andvolatile products, time: of nut shell flour particles oi substantiallypredetermined sizes embedded in said adhesive and a covering iilm oi adryable cementitiour compound around with color pigment.

5. A coating material tor surfaces comprising a cementitious materialmixed with volatile prodducts and nut shell particles of substantiallypredetermined size.

6. A coating material for surfaces comprising a mixture of air-dryinglacquer, ground with color pigment, in combination with nut shellparticles of substantially predetermined size.

JOSEPH W. AYERS.

